Sierra holds a Master's degree in Communications from Boston University (United States).
He is a war correspondent and editor of the “El Mundo” section of the Clarín newspaper (Argentina).
He was the editor of the Associated Press Latin American Service in New York.
She was a White House correspondent for CBS-Telenoticias and NBC-Canal de Noticias, and a reporter for CNN en Español.
Awards received:
- in 2008, the “María Moors Cabot” Fellowship fromthe School of Journalism at Columbia University ( United States);
- In 2005, the Wellington Foundation (Spain) awarded him a prize for his work “The Aymara Uprising,”
- in 2004, the Ibero-American Congress on Digital Journalism for “The Argentine Wetbacks,”
- in 2003, the Association of Foreign Correspondents in Spain for its coverage of the war in Iraq, and
- in 2003 by the Buenos Aires Herald as “Best Coverage in Argentine Journalism”